.kaquan{
    width: 100%;
    height: 100vh;
    background: #f5f5f5;
}
.btn{
    width: 100%;
    height: 60px;
    position: fixed;
    bottom: 0;
    border: none;
    background: #ffffff;
    border-top: 1px solid #eaeaec;
    font-size: 16px;
}